Read the scenario: You are walking a trail in the woods. You notice something out of the corner of your eye and you want to go investigate, however, the path to get to it has multiple trees that have fallen down from a storm. As you start to climb over the fallen trees, you fall and cut your knee. You decide to go back to the path and go home to clean up your cut. The next day, you notice that your cut feels warm. Describe what is happening during your immune response and explain why the surrounding area feels warm.